PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-1 Life expectancy: Not specified Hematopoietic: WBC at least 3,000/mm3 Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL AST no greater than 2 times upper limit of normal Renal: Creatinine no greater than 1.5 mg/dL Other: Not pregnant Negative pregnancy test Fertile patients must use effective contraception for 1 week prior to, during, and for at least 2 weeks after study No active bacterial infection requiring treatment with antibiotics